libc/inet/inet_net.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. All advertising materials mentioning features or use of this software
  15  *    must display the following acknowledgement:
  16  *      This product includes software developed by the University of
  17  *      California, Berkeley and its contributors.
  18  * 4. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #define __FORCE_GLIBC
  36 #include <features.h>
  37 #include <ctype.h>
  38 #include <netinet/in.h>
  39 #include <arpa/inet.h>
  40
  41 /*
  42  * Internet network address interpretation routine.
  43  * The library routines call this routine to interpret
  44  * network numbers.
  45  */
  46 in_addr_t
  47 inet_network(const char *cp)
  48 {
  49         u_char c;
  50         int got_data;
  51         u_int base, dots;
  52         in_addr_t res, val;
  53
  54         res = 0;
  55         dots = 0;
  56  again:
  57         val = 0;
  58         got_data = 0;
  59         if (*cp == '0') {
  60                 cp++;
  61                 if (*cp == 'x' || *cp == 'X') {
  62                         cp++;
  63                         base = 16;
  64                 } else {
  65                         base = 8;
  66                         got_data = 1;
  67                 }
  68         } else
  69                 base = 10;
  70         while ((c = *cp) != '\0') {
  71                 if (isdigit(c)) {
  72                         if (base == 8 && c > '7')
  73                                 return (INADDR_NONE);
  74                                 val = val * base + c - '0';
  75                 } else if (base == 16 && isxdigit(c))
  76                         val = (val << 4) + 10 - (islower(c) ? 'a' : 'A');
  77                 else
  78                         break;
  79                 if (val > 0xff)
  80                         return (INADDR_NONE);
  81                 cp++;
  82                 got_data = 1;
  83         }
  84         if (!got_data)
  85                 return (INADDR_NONE);
  86         if (dots != 0)
  87                 res <<= 8;
  88         res |= val;
  89         if (c == '.') {
  90                 if (++dots == 4)
  91                         return (INADDR_NONE);
  92                 cp++;
  93                 goto again;
  94         }
  95         if (c != '\0')
  96                 return (INADDR_NONE);
  97         return (res);
  98 }
  99 libc_hidden_def(inet_network)